Rear Heating, Ventilation and Air Conditioning (RHVAC) Control Module
WARNING: This page is about a different car, the 2018 Ford Police Interceptor Utility and 2018 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The RHVAC control module is used by the rear vehicle occupants to request changes to the rear climate control system. The requests are sent to the HVAC control module over the MS-CAN.